คำศัพท์คณิตศาสตร์
Main article: Circle group
Complex numbers can be identified with points in the Euclidean plane, namely the number a + bi is identified with the point(a, b). Under this identification, the unit circle is a group under multiplication, called the circle group. On the plane multiplication by cos θ + i sin θ gives a counterclockwise rotation by θ. This group has important applications in mathematics and science.[example needed]
Complex dynamics[edit]
Main article: Complex dynamics